我长得不高刚好到你心脏
[wŏ zhăng dé bù gāo gāng hăo dào nĭ xīn zàng]
The nickname translates into English as: 'I'm not very tall, but just reach your heart.' Perhaps there's romance between the words, showing a person whose height is just right to be physically closer to their lover’s heart, metaphorically signifying the closeness or intimacy between lovers.